A method for producing renewable c3 hydrocarbons and renewable aromatic hydrocarbons
AssigneeNeste Oyj
InventorsEveliina MÄKELÄ, Marja TIITTA, Marja-Liisa KÄRKKÄINEN
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Abstract
The present invention relates to a method for producing renewable C3 hydrocarbons D and renewable aromatic hydrocarbons E from a renewable feedstock A, in particular to methods comprising hydrodeoxygenation (20) and catalytic cracking (40) steps wherein the catalytic cracking is catalysed by a catalyst comprising a zeolite and a support, wherein the zeolite is a 12-membered ring zeolite with a pore size below 0.7 nm.
Claims17
A method for producing renewable C3 hydrocarbons and renewable aromatic hydrocarbons from a renewable feedstock selected from animal oils, animal fats, plant oils, vegetable oils, microbial oils, and mixtures thereof, the method comprising the following steps:
- a) providing renewable feedstock,
- b) pre-treating the renewable feedstock by reducing the amount of impurities therein not to include:
- more than 10 w-ppm alkali metal and alkaline earth metal impurities, calculated as elemental alkali metals and alkaline earth metals;
- more than 10 w-ppm other metals, calculated as elemental metals;
- more than 1000 w-ppm nitrogen containing impurities, calculated as elemental nitrogen;
- more than 30 w-ppm phosphorus containing impurities, calculated as elemental phosphorus;
- more than 5 w-ppm silicon containing impurities, calculated as elemental silicon;
- to produce a pre-treated feedstock,
- c) subjecting the pre-treated feedstock to hydrodeoxygenation reaction to produce a hydrodeoxygenated stream, wherein the hydrodeoxygenation reaction comprise one or more of:
- a. a temperature in the range from 250° C. to 400° C.,
- b. a pressure in the range from 10 bar to 200 bar,
- c. a WHSV in the range from 0.25 h−1 to 3 h−1,
- d. a H2 flow of 350 to 1500 N-L H2/L feed, and
- e. a hydrodeoxygenation catalyst selected from Pd, Pt, Ni, Co, Mo, Ru, Rh, and W or any combination thereof, on a support,
- d) subjecting the hydrodeoxygenated stream to a gas-liquid separation to produce a gaseous stream and a hydrodeoxygenated liquid stream,
- e) subjecting the hydrodeoxygenated liquid stream to catalytic cracking conditions comprising
- i. a temperature in a range from 300° C. to 700° C., preferably in a range from 330° C. to 500° C.,
- ii. a residence time from 0.2 s to 7200 s, and
- iii. a catalyst comprising a zeolite and a support, wherein the zeolite is ZSM-12 with a pore size below 0.7 nm,
- to produce a catalytically cracked stream, and subsequently
- f) separating the catalytically cracked stream at least to
- i) a fraction comprising the renewable C3 hydrocarbons, and
- ii) a fraction comprising the renewable aromatic hydrocarbons.
-20. (canceled)
Dependencies are inferred from the claim text.